When was your most accurate time?

I have been reading more and more about people testing positive on hcg tests other times of the day before their fmu. As for me I drink about a large glass and a half of water at night before bed with my pills. So I get up a couple times thru the night to go to the bathroom. Some times only once depending on my water intake throughout the day. So is my fmu probably too diluted. I am holding my urine now and drinking anything for 4 hours and hoping maybe I will get a bfp. But what was y'alls stories? Btw I am about 4 days early from af. Fingers crossed and baby dust to you all